Orbital Complications of Sinusitis — MCQs

10 questions

A young girl with a previous history of repeated pain over the medial canthus and chronic use of decongestants now presents with intense chills, rigors, and diplopia on lateral gaze. Examination shows an optic disc that is congested. The most likely diagnosis would be:

Which route is most preferred for Endophthalmitis treatment

A patient presents with eye pain, redness, and blurred vision after sleeping in contact lenses. Fluorescein staining reveals a corneal ulcer. What is the most appropriate management?

A man presents 6 hrs after head injury complaining of mild proptosis and scleral hyperemia:

Which fungus is most commonly associated with orbital cellulitis in patients with diabetic ketoacidosis?

Commonest cause for acute sinusitis is:

A young man following RTA presented with proptosis and pain in the right eye after four days. On examination, there is periorbital ecchymosis on the forehead and right eye. What is the diagnosis -

During a baseball game, the pitcher is hit in the left eye with a hard-hit line drive. He is rushed to the nearest emergency department where CT scan reveals left orbital rim and floor fractures and fluid in the left maxillary sinus. What are physical findings likely to include?

Which of the following is wrong regarding ophthalmic artery

Q10

Red flags in chronic rhinosinusitis include all EXCEPT:

Orbital Complications of Sinusitis Indian Medical PG Practice Questions and MCQs

Question 1: A young girl with a previous history of repeated pain over the medial canthus and chronic use of decongestants now presents with intense chills, rigors, and diplopia on lateral gaze. Examination shows an optic disc that is congested. The most likely diagnosis would be:

A. Orbital Apex Syndrome
B. Orbital Cellulitis
C. Ethmoidal Sinusitis
D. Cavernous Sinus Thrombosis (Correct Answer)

Explanation: ***Cavernous Sinus Thrombosis*** - The combination of **chills**, **rigors**, **diplopia on lateral gaze** (due to abducens nerve palsy), and a **congested optic disc** points strongly to cavernous sinus thrombosis [1]. - A history of recurrent **medial canthus pain** and **decongestant use** suggests underlying sinusitis, which is a common predisposing factor for this thrombotic event [1]. Rigors specifically represent a rapid rise in body temperature often associated with bacterial infection [2]. *Ethmoidal Sinusitis* - While ethmoidal sinusitis can spread to the orbit, it typically presents with **localized pain**, **tenderness**, and **periorbital swelling**, rather than systemic symptoms like chills, rigors, and diplopia indicating cranial nerve involvement. - A **congested optic disc** is more indicative of increased intracranial pressure or orbital congestion, which is a more severe complication than isolated ethmoidal sinusitis [3]. *Orbital Cellulitis* - **Orbital cellulitis** presents with **proptosis**, **ophthalmoplegia**, **eyelid swelling**, and **erythema**, often with fever. While it can cause diplopia, the intense systemic symptoms (rigors) and a congested optic disc are more suggestive of an intracranial rather than purely orbital process. - It does not typically cause the prominent abducens nerve palsy or the systemic severity seen in cavernous sinus thrombosis without direct spread. *Orbital Apex Syndrome* - **Orbital apex syndrome** involves cranial nerves II, III, IV, V1, and VI, leading to **vision loss**, **ophthalmoplegia**, and **facial numbness**. While it includes diplopia and can affect the optic nerve (leading to congestion), the intense systemic symptoms of **chills** and **rigors** (suggesting widespread infection/sepsis) are less characteristic of orbital apex syndrome itself and more indicative of a direct thrombotic or septic process like cavernous sinus thrombosis.

Question 2: Which route is most preferred for Endophthalmitis treatment

A. Topical antibiotic
B. Intravenous antibiotic
C. Intravitreal antibiotic (Correct Answer)
D. Oral antibiotic

Explanation: ***Intravitreal antibiotic*** - **Intravitreal injection** ensures high concentrations of antibiotics directly reach the **vitreous cavity**, which is essential for treating intraocular infections like endophthalmitis effectively. - This route bypasses ocular barriers, achieving therapeutic levels at the site of infection that would be difficult to attain with systemic or topical approaches. *Topical antibiotic* - **Topical antibiotics** have limited penetration into the **vitreous**, making them generally ineffective as a sole therapy for established endophthalmitis. - They are primarily used for **conjunctivitis** or prophylaxis after surgery, not for deep-seated intraocular infections. *Intravenous antibiotic* - While **intravenous antibiotics** can achieve systemic levels, their ability to cross the **blood-retinal barrier** and reach effective concentrations in the vitreous is often insufficient for endophthalmitis. - They may be used as an **adjunct therapy** but are not preferred as the primary route for direct infection treatment. *Oral antibiotic* - **Oral antibiotics** have poor penetration into the **vitreous cavity**, similar to intravenous drugs, and are generally inadequate for treating endophthalmitis. - They are not considered a primary treatment route due to the rapid progression and potential for severe vision loss associated with the condition.

Question 3: A patient presents with eye pain, redness, and blurred vision after sleeping in contact lenses. Fluorescein staining reveals a corneal ulcer. What is the most appropriate management?

A. Topical antibiotics (Correct Answer)
B. Oral antibiotics
C. Topical corticosteroids
D. Saline irrigation

Explanation: ***Topical antibiotics*** - A **corneal ulcer**, especially in a contact lens wearer, is highly suspicious for **bacterial infection**, necessitating immediate and aggressive topical antibiotic therapy. - **Broad-spectrum antibiotics** (e.g., fluoroquinolones) are often started empirically and adjusted based on culture results. *Oral antibiotics* - **Systemic antibiotics** are generally not indicated for uncomplicated bacterial corneal ulcers, as they don't achieve sufficient concentrations in the cornea to be effective. - They may be considered for severe cases with limbal involvement or scleral extension, or if there is a concern for concurrent systemic infection. *Topical corticosteroids* - **Corticosteroids** are contraindicated in the initial management of suspected infectious corneal ulcers because they can suppress the immune response and worsen the infection. - They may be cautiously used later in treatment to reduce inflammation after the infection is well-controlled. *Saline irrigation* - While helpful for removing foreign bodies or debris, **saline irrigation alone** is insufficient to treat a bacterial corneal ulcer. - It does not eradicate the infection and delaying definitive antibiotic treatment can lead to severe complications.

Question 4: A man presents 6 hrs after head injury complaining of mild proptosis and scleral hyperemia:

A. Caroticocavernous fistula
B. Retro-orbital hematoma (Correct Answer)
C. Pneumo-orbit
D. Orbital cellulitis

Explanation: ***Retro-orbital hematoma*** - The sudden onset of **proptosis** and **scleral hyperemia** within hours of a head injury is highly suggestive of bleeding behind the eye. - A **retro-orbital hematoma** causes increased orbital pressure, leading to the forward displacement of the eyeball (proptosis) and conjunctival injection (scleral hyperemia). *Caroticocavernous fistula* - This condition involves an abnormal communication between the carotid artery and the cavernous sinus, typically presenting with a **pulsatile proptosis** and a **bruit** over the eye. - While it can cause proptosis and hyperemia, its onset is usually not as acute as 6 hours post-trauma without being a direct major vessel injury in a recent trauma. *Pneumo-orbit* - A pneumo-orbit involves **air entering the orbit**, often following trauma that fractures an orbital wall communicating with a paranasal sinus. - Symptoms include **periorbital crepitus** and exophthalmos, but scleral hyperemia is not a primary or dominant feature. *Orbital cellulitis* - Orbital cellulitis is an **infection of the orbital tissues**, usually presenting with proptosis, ophthalmoplegia, pain, and fever. - This is an infectious process and would typically take longer than 6 hours to develop to such an extent after an acute trauma without an open wound or obvious contamination.

Question 5: Which fungus is most commonly associated with orbital cellulitis in patients with diabetic ketoacidosis?

A. Candida
B. Mucor
C. Rhizopus (Correct Answer)
D. Aspergillus

Explanation: ***Rhizopus*** - *Rhizopus* is the most common cause of **mucormycosis** (also called zygomycosis), an aggressive fungal infection that frequently affects immunocompromised patients, especially those with **diabetic ketoacidosis (DKA)**. - *Rhizopus arrhizus* (formerly *R. oryzae*) accounts for approximately **70% of all mucormycosis cases**, making it the single most common causative organism. - In DKA, the acidic environment and high glucose levels favor the growth of **Mucorales fungi**, leading to rapid progression from the sinuses to the orbit and brain (rhinoorbital-cerebral mucormycosis). *Candida* - While *Candida* is a common cause of fungal infections, it typically manifests as **candidemia**, **esophagitis**, or **vulvovaginitis**, and is rarely associated with orbital cellulitis in DKA. - *Candida* infections are more likely in patients with indwelling catheters or those on broad-spectrum antibiotics, rather than specifically linked to DKA-induced orbital cellulitis. *Mucor* - The genus *Mucor* is part of the **Mucorales order** and can cause **mucormycosis** with identical clinical presentations to *Rhizopus*. - However, *Mucor* species account for only **10-20% of mucormycosis cases**, making *Rhizopus* the **most commonly** associated genus as asked in the question. - While both are clinically grouped under "mucormycosis," *Rhizopus* is the more specific and statistically correct answer when identifying the most common causative fungus. *Aspergillus* - *Aspergillus* species are common environmental fungi that can cause invasive infections, particularly in immunocompromised patients, leading to conditions like **aspergilloma** or **invasive aspergillosis**. - While *Aspergillus* can cause sinus and orbital infections, it is less commonly associated with the rapid, aggressive form of orbital cellulitis seen in DKA compared to mucormycosis caused by *Rhizopus*.

Question 6: Commonest cause for acute sinusitis is:

A. Swimming/Diving
B. Acute rhinitis (Correct Answer)
C. Nasal tumours
D. Deviated nasal septum

Explanation: **Acute rhinitis** - **Acute rhinitis**, commonly known as the common cold, is the most frequent precursor to acute sinusitis due to inflammation and obstruction of the ostia. - The **inflammation** and **edema** of the nasal passages in rhinitis can block the sinus drainage pathways, leading to fluid accumulation and secondary bacterial infection within the sinuses. *Swimming/Diving* - While **swimming** and **diving** can introduce water and pathogens into the sinuses, leading to sinusitis, they are not the most common cause overall. - **Pressure changes** and chemical irritants like chlorine can also contribute, but usually as an exacerbating factor rather than the primary etiology. *Nasal tumours* - **Nasal tumors** can cause chronic sinusitis by physically obstructing sinus drainage, but they are relatively rare and not the most common cause of acute sinusitis. - Symptoms typically develop **gradually** and may include unilateral nasal obstruction, epistaxis, or facial pain, which are distinct from acute inflammatory onset. *Deviated nasal septum* - A **deviated nasal septum** can predispose individuals to sinusitis by impairing mucociliary clearance and ventilation of the sinuses, but it is a predisposing factor rather than the direct cause of acute sinusitis itself. - Often contributes to **recurrent** or **chronic sinusitis** by creating anatomical blockages, but an acute infectious trigger is usually necessary for an acute episode.

Question 7: A young man following RTA presented with proptosis and pain in the right eye after four days. On examination, there is periorbital ecchymosis on the forehead and right eye. What is the diagnosis -

A. Internal carotid artery aneurysm
B. Fracture of sphenoid
C. Carotico-cavernous fistula (Correct Answer)
D. Cavernous sinus thrombosis

Explanation: ***Carotico-cavernous fistula*** - A carotico-cavernous fistula (CCF) following trauma, such as a **road traffic accident (RTA)**, is characterized by a direct connection between the **internal carotid artery** and the **cavernous sinus**. - **Key diagnostic feature**: CCF typically presents with a **delayed onset (3-5 days post-trauma)**, which matches this patient's 4-day timeline perfectly. - This leads to arterial blood flowing into the venous system, causing symptoms like **proptosis**, **pain**, chemosis (conjunctival congestion), and **periorbital ecchymosis** due to venous congestion and orbital swelling. - Additional classic features include pulsating exophthalmos, orbital bruit, and conjunctival injection. *Internal carotid artery aneurysm* - An internal carotid artery (ICA) aneurysm can cause symptoms due to compression of adjacent structures (e.g., cranial nerves) or rupture. - While it can occur post-trauma, it typically does not directly lead to the rapid onset of **proptosis** and orbital congestion seen in this case without rupture into the cavernous sinus, which would then become a CCF. - ICA aneurysms usually present with cranial nerve palsies or headache rather than isolated proptosis. *Fracture of sphenoid* - A sphenoid fracture can produce various neurological deficits depending on the fracture's location and extent, potentially involving cranial nerves, optic chiasm, or internal carotid artery. - However, isolated sphenoid fractures are less likely to cause **progressive proptosis** developing over days without other signs like vision loss, diplopia, or CSF leakage. - The **delayed presentation** argues against a simple fracture and suggests a vascular complication like CCF. *Cavernous sinus thrombosis* - Cavernous sinus thrombosis (CST) is usually caused by an **infection** (e.g., from sinusitis, facial cellulitis) and presents with fever, severe headache, and characteristic cranial nerve palsies (**III, IV, V1, V2, VI**), often bilateral. - While CST can cause **proptosis** and orbital pain, the absence of fever and infectious signs, along with the **traumatic history**, makes CCF a more probable diagnosis. - CST typically has a more acute presentation (hours to 1-2 days) compared to the 4-day delay seen here.

Question 8: During a baseball game, the pitcher is hit in the left eye with a hard-hit line drive. He is rushed to the nearest emergency department where CT scan reveals left orbital rim and floor fractures and fluid in the left maxillary sinus. What are physical findings likely to include?

A. Exophthalmos
B. Cheek numbness (Correct Answer)
C. Lateral diplopia
D. Epistaxis

Explanation: ***Cheek numbness*** - **Orbital floor fractures** commonly damage the **infraorbital nerve**, which runs through the **infraorbital canal** in the orbital floor. - The infraorbital nerve provides sensation to the **lower eyelid, upper cheek, lateral nose, upper lip, and upper gingiva**. - **Cheek numbness (infraorbital nerve paresthesia) is the MOST COMMON physical finding** in orbital floor fractures, occurring in up to 80% of cases. - This is a classic exam finding and key diagnostic feature. *Epistaxis* - While theoretically possible if there's communication between the orbit and nasal cavity, **epistaxis is NOT a common or characteristic finding** in isolated orbital floor fractures. - Would require significant displacement with direct nasal involvement or fracture extension into the nasal bones. - The fluid in the maxillary sinus on CT represents blood/edema, not necessarily active nasal bleeding. *Exophthalmos* - This term means **protrusion of the eyeball** forward from the orbit. - Orbital floor fractures cause the OPPOSITE finding: **enophthalmos** (recession of the eyeball backward). - This occurs due to herniation of orbital contents (fat, muscles) into the enlarged orbital cavity (maxillary sinus). *Lateral diplopia* - **Lateral diplopia** (horizontal double vision) results from dysfunction of the **medial or lateral rectus muscles** (or their nerves). - Orbital floor fractures characteristically cause **VERTICAL diplopia** due to entrapment or contusion of the **inferior rectus muscle** or **inferior oblique muscle**. - Patients have double vision when looking up or down, not side to side.

Question 9: Which of the following is wrong regarding ophthalmic artery

A. Leaves orbit through inferior orbital fissure (Correct Answer)
B. Artery to retina is end artery
C. Supplies anterior ethmoidal sinus
D. Present in dura along with optic nerve

Explanation: ***Leaves orbit through inferior orbital fissure*** - The **ophthalmic artery** enters the orbit through the **optic canal** with the optic nerve, not the inferior orbital fissure. - The **inferior orbital fissure** transmits structures like the inferior ophthalmic vein, infraorbital nerve, and zygomatic nerve, but not the primary entry of the ophthalmic artery. *Artery to retina is end artery* - The **central retinal artery**, a branch of the ophthalmic artery, is a true **end artery**, meaning it has no significant anastomoses. - Obstruction of the central retinal artery leads to **irreversible blindness** due to lack of collateral blood supply to the retina. *Supplies anterior ethmoidal sinus* - The **anterior ethmoidal artery** is a branch of the ophthalmic artery. - It supplies the **ethmoidal air cells** (including the anterior ethmoidal sinus) and parts of the nasal cavity. *Present in dura along with optic nerve* - The **ophthalmic artery** enters the orbit by passing through the **dural sheath** that surrounds the optic nerve within the optic canal. - This close anatomical relationship explains why conditions affecting the optic nerve can sometimes impact ophthalmic artery flow.

Question 10: Red flags in chronic rhinosinusitis include all EXCEPT:

A. Bloody discharge
B. Orbital complications
C. Frontal headache (Correct Answer)
D. Unilateral symptoms

Explanation: ***Frontal headache*** - A frontal headache is a common symptom of chronic rhinosinusitis itself, often due to **sinus pressure** or inflammation. - While it can be bothersome, it is not considered a "red flag" indicating a **serious complication** or alternative diagnosis. *Bloody discharge* - **Bloody nasal discharge** or epistaxis, especially when unilateral or persistent, can be a red flag for more serious underlying conditions, such as **nasal malignancy**. - It warrants further investigation to rule out neoplasms or other vascular pathologies. *Orbital complications* - Orbital complications, such as **periorbital edema**, proptosis, vision changes, or ophthalmoplegia, indicate spreading infection beyond the sinuses. - These are red flags because they suggest **severe infection** that can lead to permanent vision loss or intracranial spread. *Unilateral symptoms* - **Unilateral nasal obstruction**, discharge, pain, or facial swelling are significant red flags that should prompt concern for **nasal polyps**, tumors, or fungal infections. - Unilateral symptoms suggest a localized process that is less likely to be typical chronic rhinosinusitis unless proven otherwise.

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